window.addEventListener("load", function () {
  //911系列分类栏的隐藏显示
  var span = document.querySelector(".icon-menu");
  var tab = document.querySelector(".tab ul");
  var classify = document.querySelector(".classify");
  span.addEventListener("mouseenter", function () {
    tab.style.display = "block";
  });
  classify.addEventListener("mouseleave", function () {
    tab.style.display = "none";
  });
  //工具服务
  
});
